.clearfix{
	zoom:1;
	&:after{
		display:block;
		height:0;
		content:"";
		clear:both;
	}
}

body {

	ul{
		@extend .clearfix;

		li{
			float:left;
			margin-left:15px;
			background-color:#f19d9d;

			&:nth-of-type(2n){
				background-color:#037e7e;
			}
		}
	}
}